Add a C binding to the Target and TargetMachine classes to allow for emitting

binary and assembly. Patch by Carlo Kok.  Emitting was inspired by but not based
on the D llvm bindings. 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154493 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 340 insertions, 0 deletions

diff --git a/include/llvm-c/TargetMachine.h b/include/llvm-c/TargetMachine.h
new file mode 100644
index 0000000000..0d35d73a11
--- /dev/null
+++ b/include/llvm-c/TargetMachine.h
@@ -0,0 +1,142 @@
+/*===-- llvm-c/TargetMachine.h - Target Machine Library C Interface - C++ -*-=*\
+|*                                                                            *|
+|*                     The LLVM Compiler Infrastructure                       *|
+|*                                                                            *|
+|* This file is distributed under the University of Illinois Open Source      *|
+|* License. See LICENSE.TXT for details.                                      *|
+|*                                                                            *|
+|*===----------------------------------------------------------------------===*|
+|*                                                                            *|
+|* This header declares the C interface to the Target and TargetMachine       *|
+|* classes, which can be used to generate assembly or object files.           *|
+|*                                                                            *|
+|* Many exotic languages can interoperate with C code but have a harder time  *|
+|* with C++ due to name mangling. So in addition to C, this interface enables *|
+|* tools written in such languages.                                           *|
+|*                                                                            *|
+\*===----------------------------------------------------------------------===*/
+
+#ifndef LLVM_C_TARGETMACHINE_H
+#define LLVM_C_TARGETMACHINE_H
+
+#include "llvm-c/Core.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+typedef struct LLVMTargetMachine *LLVMTargetMachineRef;
+typedef struct LLVMTarget *LLVMTargetRef;
+
+typedef enum {
+    LLVMCodeGenLevelNone,
+    LLVMCodeGenLevelLess,
+    LLVMCodeGenLevelDefault,
+    LLVMCodeGenLevelAggressive
+} LLVMCodeGenOptLevel;
+
+typedef enum {
+    LLVMRelocDefault,
+    LLVMRelocStatic,
+    LLVMRelocPIC,
+    LLVMRelocDynamicNoPic
+} LLVMRelocMode;
+
+typedef enum {
+    LLVMCodeModelDefault,
+    LLVMCodeModelJITDefault,
+    LLVMCodeModelSmall,
+    LLVMCodeModelKernel,
+    LLVMCodeModelMedium,
+    LLVMCodeModelLarge
+} LLVMCodeModel;
+
+typedef enum {
+    LLVMAssemblyFile,
+    LLVMObjectFile
+} LLVMCodeGenFileType;
+
+/** Returns the first llvm::Target in the registered targets list. */
+LLVMTargetRef LLVMGetFirstTarget();
+/** Returns the next llvm::Target given a previous one (or null if there's none) */
+LLVMTargetRef LLVMGetNextTarget(LLVMTargetRef T);
+
+/*===-- Target ------------------------------------------------------------===*/
+/** Returns the name of a target. See llvm::Target::getName */
+const char *LLVMGetTargetName(LLVMTargetRef T);
+
+/** Returns the description  of a target. See llvm::Target::getDescription */
+const char *LLVMGetTargetDescription(LLVMTargetRef T);
+
+/** Returns if the target has a JIT */
+LLVMBool LLVMTargetHasJIT(LLVMTargetRef T);
+
+/** Returns if the target has a TargetMachine associated */
+LLVMBool LLVMTargetHasTargetMachine(LLVMTargetRef T);
+
+/** Returns if the target as an ASM backend (required for emitting output) */
+LLVMBool LLVMTargetHasAsmBackend(LLVMTargetRef T);
+
+/*===-- Target Machine ----------------------------------------------------===*/
+/** Creates a new llvm::TargetMachine. See llvm::Target::createTargetMachine */
+LLVMTargetMachineRef LLVMCreateTargetMachine(LLVMTargetRef T, char *Triple,
+  char *CPU, char *Features, LLVMCodeGenOptLevel Level, LLVMRelocMode Reloc,
+  LLVMCodeModel CodeModel);
+
+/** Dispose the LLVMTargetMachineRef instance generated by
+  LLVMCreateTargetMachine. */
+void LLVMDisposeTargetMachine(LLVMTargetMachineRef T);
+
+/** Returns the Target used in a TargetMachine */
+LLVMTargetRef LLVMGetTargetMachineTarget(LLVMTargetMachineRef T);
+
+/** Returns the triple used creating this target machine. See
+  llvm::TargetMachine::getTriple. The result needs to be disposed with
+  LLVMDisposeMessage. */
+char *LLVMGetTargetMachineTriple(LLVMTargetMachineRef T);
+
+/** Returns the cpu used creating this target machine. See
+  llvm::TargetMachine::getCPU. The result needs to be disposed with
+  LLVMDisposeMessage. */
+char *LLVMGetTargetMachineCPU(LLVMTargetMachineRef T);
+
+/** Returns the feature string used creating this target machine. See
+  llvm::TargetMachine::getFeatureString. The result needs to be disposed with
+  LLVMDisposeMessage. */
+char *LLVMGetTargetMachineFeatureString(LLVMTargetMachineRef T);
+
+/** Returns the llvm::TargetData used for this llvm:TargetMachine. */
+LLVMTargetDataRef LLVMGetTargetMachineData(LLVMTargetMachineRef T);
+
+/** Emits an asm or object file for the given module to the filename. This
+  wraps several c++ only classes (among them a file stream). Returns any
+  error in ErrorMessage. Use LLVMDisposeMessage to dispose the message. */
+LLVMBool LLVMTargetMachineEmitToFile(LLVMTargetMachineRef T, LLVMModuleRef M,
+  char *Filename, LLVMCodeGenFileType codegen, char **ErrorMessage);
+
+
+
+
+#ifdef __cplusplus
+}
+
+namespace llvm {
+  class TargetMachine;
+  class Target;
+
+  inline TargetMachine *unwrap(LLVMTargetMachineRef P) {
+    return reinterpret_cast<TargetMachine*>(P);
+  }
+  inline Target *unwrap(LLVMTargetRef P) {
+    return reinterpret_cast<Target*>(P);
+  }
+  inline LLVMTargetMachineRef wrap(const TargetMachine *P) {
+    return reinterpret_cast<LLVMTargetMachineRef>(
+      const_cast<TargetMachine*>(P));
+  }
+  inline LLVMTargetRef wrap(const Target * P) {
+    return reinterpret_cast<LLVMTargetRef>(const_cast<Target*>(P));
+  }
+}
+#endif
+
+#endif
diff --git a/lib/Target/CMakeLists.txt b/lib/Target/CMakeLists.txt
index d8bc7439f6..5913a9c4cc 100644
--- a/lib/Target/CMakeLists.txt
+++ b/lib/Target/CMakeLists.txt
@@ -9,6 +9,7 @@ add_llvm_library(LLVMTarget
   TargetLibraryInfo.cpp
   TargetLoweringObjectFile.cpp
   TargetMachine.cpp
+  TargetMachineC.cpp
   TargetRegisterInfo.cpp
   TargetSubtargetInfo.cpp
   )
diff --git a/lib/Target/TargetMachineC.cpp b/lib/Target/TargetMachineC.cpp
new file mode 100644
index 0000000000..d6bba8b0dd
--- /dev/null
+++ b/lib/Target/TargetMachineC.cpp
@@ -0,0 +1,197 @@
+//===-- TargetMachine.cpp -------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the LLVM-C part of TargetMachine.h
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm-c/Core.h"
+#include "llvm-c/Target.h"
+#include "llvm-c/TargetMachine.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/CodeGen.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Module.h"
+#include "llvm/PassManager.h"
+#include <cassert>
+#include <cstdlib>
+#include <cstring>
+
+using namespace llvm;
+
+
+
+LLVMTargetRef LLVMGetFirstTarget() {
+   const Target* target = &*TargetRegistry::begin();
+   return wrap(target);
+}
+LLVMTargetRef LLVMGetNextTarget(LLVMTargetRef T) {
+  return wrap(unwrap(T)->getNext());
+}
+
+const char * LLVMGetTargetName(LLVMTargetRef T) {
+  return unwrap(T)->getName();
+}
+
+const char * LLVMGetTargetDescription(LLVMTargetRef T) {
+  return unwrap(T)->getShortDescription();
+}
+
+LLVMBool LLVMTargetHasJIT(LLVMTargetRef T) {
+  return unwrap(T)->hasJIT();
+}
+
+LLVMBool LLVMTargetHasTargetMachine(LLVMTargetRef T) {
+  return unwrap(T)->hasTargetMachine();
+}
+
+LLVMBool LLVMTargetHasAsmBackend(LLVMTargetRef T) {
+  return unwrap(T)->hasMCAsmBackend();
+}
+
+LLVMTargetMachineRef LLVMCreateTargetMachine(LLVMTargetRef T, char* Triple,
+  char* CPU, char* Features, LLVMCodeGenOptLevel Level, LLVMRelocMode Reloc,
+  LLVMCodeModel CodeModel) {
+  Reloc::Model RM;
+  switch (Reloc){
+    case LLVMRelocStatic:
+      RM = Reloc::Static;
+      break;
+    case LLVMRelocPIC:
+      RM = Reloc::PIC_;
+      break;
+    case LLVMRelocDynamicNoPic:
+      RM = Reloc::DynamicNoPIC;
+      break;
+    default:
+      RM = Reloc::Default;
+      break;
+  }
+
+  CodeModel::Model CM;
+  switch (CodeModel) {
+    case LLVMCodeModelJITDefault:
+      CM = CodeModel::JITDefault;
+      break;
+    case LLVMCodeModelSmall:
+      CM = CodeModel::Small;
+      break;
+    case LLVMCodeModelKernel:
+      CM = CodeModel::Kernel;
+      break;
+    case LLVMCodeModelMedium:
+      CM = CodeModel::Medium;
+      break;
+    case LLVMCodeModelLarge:
+      CM = CodeModel::Large;
+      break;
+    default:
+      CM = CodeModel::Default;
+      break;
+  }
+  CodeGenOpt::Level OL;
+
+  switch (Level) {
+    case LLVMCodeGenLevelNone:
+      OL = CodeGenOpt::None;
+      break;
+    case LLVMCodeGenLevelLess:
+      OL = CodeGenOpt::Less;
+      break;
+    case LLVMCodeGenLevelAggressive:
+      OL = CodeGenOpt::Aggressive;
+      break;
+    default:
+      OL = CodeGenOpt::Default;
+      break;
+  }
+
+  TargetOptions opt;
+  return wrap(unwrap(T)->createTargetMachine(Triple, CPU, Features, opt, RM,
+    CM, OL));
+}
+
+
+void LLVMDisposeTargetMachine(LLVMTargetMachineRef T) {
+  delete unwrap(T);
+}
+
+LLVMTargetRef LLVMGetTargetMachineTarget(LLVMTargetMachineRef T) {
+  const Target* target = &(unwrap(T)->getTarget());
+  return wrap(target);
+}
+
+char* LLVMGetTargetMachineTriple(LLVMTargetMachineRef T) {
+  std::string StringRep = unwrap(T)->getTargetTriple();
+  return strdup(StringRep.c_str());
+}
+
+char* LLVMGetTargetMachineCPU(LLVMTargetMachineRef T) {
+  std::string StringRep = unwrap(T)->getTargetCPU();
+  return strdup(StringRep.c_str());
+}
+
+char* LLVMGetTargetMachineFeatureString(LLVMTargetMachineRef T) {
+  std::string StringRep = unwrap(T)->getTargetFeatureString();
+  return strdup(StringRep.c_str());
+}
+
+LLVMTargetDataRef LLVMGetTargetMachineData(LLVMTargetMachineRef T) {
+  return wrap(unwrap(T)->getTargetData());
+}
+
+LLVMBool LLVMTargetMachineEmitToFile(LLVMTargetMachineRef T, LLVMModuleRef M,
+  char* Filename, LLVMCodeGenFileType codegen, char** ErrorMessage) {
+  TargetMachine* TM = unwrap(T);
+  Module* Mod = unwrap(M);
+
+  PassManager pass;
+
+  std::string error;
+
+  const TargetData* td = TM->getTargetData();
+
+  if (!td) {
+    error = "No TargetData in TargetMachine";
+    *ErrorMessage = strdup(error.c_str());
+    return true;
+  }
+  pass.add(new TargetData(*td));
+
+  TargetMachine::CodeGenFileType ft;
+  switch (codegen) {
+    case LLVMAssemblyFile:
+      ft = TargetMachine::CGFT_AssemblyFile;
+      break;
+    default:
+      ft = TargetMachine::CGFT_ObjectFile;
+      break;
+  }
+  raw_fd_ostream dest(Filename, error, raw_fd_ostream::F_Binary);
+  formatted_raw_ostream destf(dest);
+  if (!error.empty()) {
+    *ErrorMessage = strdup(error.c_str());
+    return true;
+  }
+
+  if (TM->addPassesToEmitFile(pass, destf, ft)) {
+    error = "No TargetData in TargetMachine";
+    *ErrorMessage = strdup(error.c_str());
+    return true;
+  }
+
+  pass.run(*Mod);
+
+  destf.flush();
+  dest.flush();
+  return false;
+}